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There are tons of low-cost and costly alternatives... it all depends upon what you are interested in doing.

I've used XMLSpy and several similar, very robust tools, and I'm currently enjoying Microsoft's no-frills XML Notepad.

What are you planning on writing in XML?

Rosenman, many thanks for your suggestion. Planned use: text in a hierarchical (not relational) database, which can be manipulated and reconfigured in various ways for use in various print productions and also on a web site.